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• W2122788894 abstract "Other| April 01, 1997 Single-crystal compression and crystal structure of clinopyroxene up to 10 GPa Li Zhang; Li Zhang University of Marburg, Institute of Mineralogy, Marburg, Federal Republic of Germany Search for other works by this author on: GSW Google Scholar Hans Ahsbahs; Hans Ahsbahs Search for other works by this author on: GSW Google Scholar Stefan S. Hafner; Stefan S. Hafner Search for other works by this author on: GSW Google Scholar Ali Kutoglu Ali Kutoglu Search for other works by this author on: GSW Google Scholar Author and Article Information Li Zhang University of Marburg, Institute of Mineralogy, Marburg, Federal Republic of Germany Hans Ahsbahs Stefan S. Hafner Ali Kutoglu Publisher: Mineralogical Society of America First Online: 02 Mar 2017 Online Issn: 1945-3027 Print Issn: 0003-004X Copyright © 1981 by the Mineralogical Society of America American Mineralogist (1997) 82 (3-4): 245–258. https://doi.org/10.2138/am-1997-3-402 Article history First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Li Zhang, Hans Ahsbahs, Stefan S. Hafner, Ali Kutoglu; Single-crystal compression and crystal structure of clinopyroxene up to 10 GPa. American Mineralogist 1997;; 82 (3-4): 245–258. doi: https://doi.org/10.2138/am-1997-3-402 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyAmerican Mineralogist Search Advanced Search Abstract The hydrostatic compression of synthetic single crystals of diopside, CaMgSi2O6, and hedenbergite, CaFeSi2O6, was studied at 33 pressures up to 10 GPa by X-ray diffraction. In addition, intensity data for hedenbergite were collected at 12 pressures up to 10 GPa. For determination of the elasticity two crystals were loaded together in a diamond cell. The axial compressibilities βa, βb, and βc of diopside and hedenbergite are 2.36(4), 3.17(4), and 2.50(4) × 10–3 GPa–1, and 1.93(5), 3.38(6), and 2.42(8) × 10–3 GPa–1, respectively. The bulk moduli (KT0) and their pressure derivatives (KT0′) were determined simultaneously from a weighted linear fit of a third order Birch-Murnaghan equation of state to the volume data at elevated pressures. KT0 and KT0′ are 104.1(9) GPa and 6.2(3) for diopside and 117(1) GPa and 4.3(4) for hedenbergite, respectively.The unit-cell parameters decrease continuously with pressure. The larger polyhedra show more compression than the smaller ones. Between 0.1 MPa and 10 GPa the polyhedral volumes of CaO8, FeO6, and SiO4 decrease by 8.4, 6.6, and 2.9%, respectively. The longest bonds of CaO8 and FeO6 show most compression. Significant compression in the two shortest Si-O1 and Si-O2 bond lengths of the SiO4 tetrahedra was observed at relatively low pressures, resulting in a tetrahedral volume compression of 1.6% between 0.1 GPa and 4 GPa and 1.3% between 4 and 10 GPa. The compression of the unit cell can be described by the volume compression of the individual CaO8 and FeO6 polyhedra, with the SiO4 tetrahedron playing a minor role. Diopside is more compressible than hedenbergite as shown by their axial and volume compressibilities because the FeO6 octahedron is significantly more rigid than MgO6 at high pressures. This observation implies that octahedrally coordinated Fe2+ behaves differently from Mg at high pressures, in contrast to their behavior at ambient conditions. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2122788894 title "Single-crystal compression and crystal structure of clinopyroxene up to 10 GPa" @default.
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